UC specimens and range limits for Polyneura latissima

• Blue markers: specimen records
• Yellow marker: type locality, if present
• Red markers: endpoints of range from literature

View map from the Consortium of Pacific Northwest Herbaria

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Illustration from DeCew's Guide to the Seaweeds of British Columbia, Washington, Oregon, and Northern California

Polyneura Kylin 1924

Thalli erect, with 1 or more blades attached by discoid holdfasts or by flattened, irregularly divided, ribbonlike branches. Blades stipitate, ovate to broadly obcuneate, entire and monostromatic when young, later becoming lobed, incised, and polystromatic throughout, without midrib but with conspicuous, anastomosing veins. Tetrasporangia tetrahedrally divided, in sori scattered over entire blade, sometimes marginal. Spermatangial sori scattered over entire blade. Cystocarps with carposporangia in chains, with ostiolate pericarp.

Polyneura latissima (Harv.) Kyl.

Hymenena latissima Harvey 1862: 170. Polyneura latissima (Harv.) Kylin 1924: 37; Smith 1944: 341.

Blades 10-15(45) cm tall, sometimes as wide, deep pink to lake red, entire when young, later lobed unevenly, sometimes with thickened stipe, anastomosing veins forming conspicuous reticulum covering all but blade margins; reproduction as for genus.

Frequent on rocks, mean tide to subtidal (27 m), Esquimalt, Vancouver I., Br. Columbia (type locality), to Baja Calif.; one of commonest subtidal species.

Excerpt from Abbott, I. A., & Hollenberg, G. J. (1976). Marine algae of California. Stanford University Press, Stanford, California. xii [xiii] + 827 pp., 701 figs.